He says the man had made several modifications to his home, including installing a fortified front door, in an attempt to hide the items.

"It's quite a large home, it's an older style home and as I say it's been set up to include all these concealed hiding spaces so our guys spent the best part of 24 hours in searching the place and logging all of the items," he said.

Sergeant Hart says it is a significant haul.

"The firearms themselves are obviously a commodity that can be trafficked, much the same as illegal drugs, and that's good to get those off the hands of the criminals, it's a financial impact on them and a logistical impact on them," he said.

"Obviously that cash is now cash that has been frozen and it can't now be used to buy more drugs or guns."

Police say investigations are continuing at another five properties the man owns in Perth and regional centres.